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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with Borrowings (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|---|---|---|---|
| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | $ 43,379,217 | $ 43,576,146 | $ 37,366,610 | $ 44,262,605 | $ 27,041,328 | $ 22,377,656 |
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Interest Rate Swap [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 23,628,148 | 21,663,148 | 19,619,000 | 18,485,000 | 16,685,000 | 14,070,000 |
|
Interest Rate Swap [Member] | Interest Rate Risk Associated with Borrowings [Member]
|
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 16,590,000 | 14,425,000 | ||||
| Derivative, Average Fixed Interest Rate | 0.848% | 0.698% | ||||
| Derivative, Average Variable Interest Rate | 0.228% | 0.235% | ||||
| Derivative, Average Remaining Period Until Maturity | 2.82 | 2.50 | ||||
|
Interest Rate Swap [Member] | Interest Rate Risk Associated with Borrowings [Member] | Derivative Maturity Within One Year From Balance Sheet Date [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 0 | 3,900,000 | ||||
| Derivative, Average Fixed Interest Rate | 0.00% | 0.30% | ||||
| Derivative, Average Variable Interest Rate | 0.00% | 0.245% | ||||
| Derivative, Average Remaining Period Until Maturity | 0.00 | 0.76 | ||||
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Interest Rate Swap [Member] | Interest Rate Risk Associated with Borrowings [Member] | Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member]
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| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 10,250,000 | 1,000,000 | ||||
| Derivative, Average Fixed Interest Rate | 0.563% | 0.383% | ||||
| Derivative, Average Variable Interest Rate | 0.228% | 0.244% | ||||
| Derivative, Average Remaining Period Until Maturity | 1.92 | 1.04 | ||||
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Interest Rate Swap [Member] | Interest Rate Risk Associated with Borrowings [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member]
|
||||||
| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 4,035,000 | 2,950,000 | ||||
| Derivative, Average Fixed Interest Rate | 0.95% | 0.626% | ||||
| Derivative, Average Variable Interest Rate | 0.23% | 0.246% | ||||
| Derivative, Average Remaining Period Until Maturity | 3.04 | 2.42 | ||||
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Interest Rate Swap [Member] | Interest Rate Risk Associated with Borrowings [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member]
|
||||||
| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | 1,125,000 | 5,300,000 | ||||
| Derivative, Average Fixed Interest Rate | 1.314% | 0.92% | ||||
| Derivative, Average Variable Interest Rate | 0.23% | 0.217% | ||||
| Derivative, Average Remaining Period Until Maturity | 3.99 | 3.49 | ||||
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Interest Rate Swap [Member] | Interest Rate Risk Associated with Borrowings [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member]
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||||||
| Derivative [Line Items] | ||||||
| Derivative, Notional Amount | $ 1,180,000 | $ 1,275,000 | ||||
| Derivative, Average Fixed Interest Rate | 2.536% | 1.406% | ||||
| Derivative, Average Variable Interest Rate | 0.228% | 0.242% | ||||
| Derivative, Average Remaining Period Until Maturity | 8.79 | 5.04 |